EP0507426A1 - Process for dissolving polyurethane foams or removing them from substrates - Google Patents
Process for dissolving polyurethane foams or removing them from substrates Download PDFInfo
- Publication number
- EP0507426A1 EP0507426A1 EP19920300034 EP92300034A EP0507426A1 EP 0507426 A1 EP0507426 A1 EP 0507426A1 EP 19920300034 EP19920300034 EP 19920300034 EP 92300034 A EP92300034 A EP 92300034A EP 0507426 A1 EP0507426 A1 EP 0507426A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- polyurethane foam
- process according
- imidazole
- solvent
- methyl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/10—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation
- C08J11/18—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material
- C08J11/28—Recovery or working-up of waste materials of polymers by chemically breaking down the molecular chains of polymers or breaking of crosslinks, e.g. devulcanisation by treatment with organic material by treatment with organic compounds containing nitrogen, sulfur or phosphorus
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J11/00—Recovery or working-up of waste materials
- C08J11/04—Recovery or working-up of waste materials of polymers
- C08J11/06—Recovery or working-up of waste materials of polymers without chemical reactions
- C08J11/08—Recovery or working-up of waste materials of polymers without chemical reactions using selective solvents for polymer components
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
- C08J3/09—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids
- C08J3/091—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in organic liquids characterised by the chemical constitution of the organic liquid
- C08J3/096—Nitrogen containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2375/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2375/04—Polyurethanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
- Y10S521/918—Physical aftertreatment of a cellular product
Definitions
- the invention relates to solvents for dissolving cured and/or uncured polyurethane foams.
- solvents have been used to clean polyurethane foam from processing equipment, metal parts and tools, both before and after the polyurethane foam has cured on them.
- Some of the solvents used include such compounds as dimethyl formamide, 1,1,1-trichloroethane, methylene chloride, chlorofluorocarbons, toluene, xylene, acetone, methyl ethyl ketone, ethylene glycol ethers, tetrahydrofuran, and gamma-butyrolactone.
- these compounds are effective solvents, the use of each presents a hazard or complication of one type or another.
- the chlorine-containing compounds are now thought to contribute to ozone depletion in the atmosphere.
- the other solvents are either toxic, suspected carcinogens, or very volatile, and thus present health and safety problems.
- polyurethane foam may be dissolved, or removed from a substrate, by contacting the polyurethane foam with a solvent comprising 1,2-dialkyl imidazole.
- a solvent comprising 1,2-dialkyl imidazole.
- One embodiment of the invention concerns a process for dissolving polyurethane foam, comprising contacting polyurethane foam with 1,2-dialkyl imidazole.
- the invention concerns a process for removing polyurethane foam from a substrate, by contacting said polyurethane foam with a solvent formulation containing 1,2-dialkyl imidazole.
- 1,2-Dialkyl imidazoles useful in the present invention may be represented by the following formula: where R1 and R2 are each an alkyl group. It is preferred that R1 and R2 each represent an alkyl group having no more than 20 carbon atoms. It is especially preferred (1) that both R1 and R2 are methyl i.e. that the 1,2-dialkyl imidazole is 1,2-dimethyl imidazole, or (2) that R1 is an isopropyl group and R2 is a methyl group, i.e. that the 1,2-dialkyl imidazole is 1-isopropyl-2-methyl imidazole. Alternatively, a mixture of 1,2-dialkyl imidazoles may be used. Some 1,2-dialkyl imidazoles are commercially available. Additionally, 1,2-dialkyl imidazoles may be prepared by the methods claimed in US-A-4921969 and -4927942.
- the solvents for which 1,2-dialkyl imidazoles may be substituted include, but are not limited to, aromatic hydrocarbons, alcohols, ketones, esters, ethers, glycol ethers, alkylene carbonates and ureas.
- Suitable co-solvents include one or more of the following: toluene, 2-ethyl-1-hexanol, ethylene glycol diacetate, 2-ethylhexyl acetate, N-methyl pyrrolidinone, tetrahydrofurfuryl alcohol, ethylene glycol butyl ether acetate, tetramethyl urea, diethylene glycol butyl ether, ethylene glycol butyl ether, methyl iso-amyl ketone, diethylene glycol methyl ether, dipropylene glycol methyl ether, dibasic ester, methyl isobutyl ketone, N,N'-dimethyl ethylene urea, propylene glycol methyl ether, cyclohexanone, diacetone alcohol, furfuryl alcohol, and isobutyl isobutyrate.
- the solvents for which 1,2-dialkyl imidazoles may be substituted, in whole or in part include the more
- the portion of conventional solvent replaced with 1,2-dialkyl imidazole in a formulation containing one or more conventional (non-1,2-dialkyl imidazole) solvents will be such that the 1,2-dialkyl imidazole and the conventional solvents in the formulation are present in a weight ratio of 1,2-dialkyl imidazole to total conventional solvent of 4:1 to 1:4, more preferably from 1:2 to 1:3.
- One skilled in the art may find other weight ratios to be optimum without departing from the scope of the present invention.
- thickeners may be included, such as ethylcellulose, hydroxypropyl cellulose, organic modified clay and hydrogenated castor oil,
- Suitable surfactants include potassium oleate, the dioctyl ester of sodium sulfosuccinic acid, sodium alkylnaphthalene sulfonate and sodium alkylbenzene sulfonate.
- the process is effective at temperatures from room temperature to 100 °C and at pressures from atmospheric to several Megapascals.
- the process of the present invention may be performed at an elevated temperature. While the process works well at room temperature, more rapid dissolution may be obtained by heating the 1,2-dialkyl imidazole-containing solvent formulation to a temeprature of 50 to 100°C.
- the solvent formulation may be applied to the polyurethane foam in any conventional manner. Typically, the polyurethane foam-coated substrate will be placed in a vat or sonic bath containing the solvent formulation. Alternatively, the sovlent formulation could be applied to the foam-coated substrate by brush or spray. The period of time for which the solvent. formulation should be permitted to work undisturbed on the polyurethane foam to be removed will vary, after which, agitation of the surfaces to be cleaned of the foam via wiping, brushing or scraping is preferred.
- Rigid polyurethane foam formulations are well known in the art and are commercially available. Rigid foams are more highly cross-linked than either elastomers or flexible foams. Other characteristics generally true of rigid polyurethane foams include (1) a structure having a high percentage of closed cells; (2) low thermal conductivity; (3) nonreversible deformability; (4) good load-bearing ability; and (5) high dimensional stability. Generally, rigid polyurethane foams are based on polyols having a molecular weight less than 1000, and more often from 400 to 800, and a functionality of 2 to 8, and more typically from 4 to 8.
- Flexible polyurethane foam formulations also are well known in the art and are commercially available. In contrast to rigid foams, flexible foams are not highly cross-linked. Other characteristics generally true of flexible polyurethane foams include (1) a structure having a high percentage of open cells; (2) air permeability; (3) reversible deformability; (4) a limited resistance to an applied load; and (5) low dimensional stability. Generally, flexible polyurethane foams are based on polyols having a molecular weight greater than 1000 (about 70 atoms or more per chain), and a functionality of 2 to 4, and more typically of 2 to 3. The invention will be further illustrated by the following examples,
- the rods were then coated with a rigid or flexible polyether-based foam formulation having the following components: Rigid Foam Component Parts by Weight Thanol® R-350-X 36.9 DC-1931 (silicon surfactant) 0.5 R11 (trichlorofluoromethane) 15.0 TEXACAT® TD-33 0.3 Rubinate M2 (polymeric isocyanate) 49.6 1Dow Corning; 2ICI.
Abstract
Description
- The invention relates to solvents for dissolving cured and/or uncured polyurethane foams.
- A variety of solvents has been used to clean polyurethane foam from processing equipment, metal parts and tools, both before and after the polyurethane foam has cured on them. Some of the solvents used include such compounds as dimethyl formamide, 1,1,1-trichloroethane, methylene chloride, chlorofluorocarbons, toluene, xylene, acetone, methyl ethyl ketone, ethylene glycol ethers, tetrahydrofuran, and gamma-butyrolactone. However, although these compounds are effective solvents, the use of each presents a hazard or complication of one type or another. For example, the chlorine-containing compounds are now thought to contribute to ozone depletion in the atmosphere. The other solvents are either toxic, suspected carcinogens, or very volatile, and thus present health and safety problems.
- We have discovered, surprisingly, that polyurethane foam may be dissolved, or removed from a substrate, by contacting the polyurethane foam with a solvent comprising 1,2-dialkyl imidazole. The present invention, by substituting 1,2-dialkyl imidazole in whole or in part for the more hazardous prior art solvents, reduces many of the health, safety and environmental hazards associated with the prior art solvents.
- One embodiment of the invention concerns a process for dissolving polyurethane foam, comprising contacting polyurethane foam with 1,2-dialkyl imidazole. In another embodiment, the invention concerns a process for removing polyurethane foam from a substrate, by contacting said polyurethane foam with a solvent formulation containing 1,2-dialkyl imidazole.
- 1,2-Dialkyl imidazoles useful in the present invention may be represented by the following formula:
where R¹ and R² are each an alkyl group. It is preferred that R¹ and R² each represent an alkyl group having no more than 20 carbon atoms. It is especially preferred (1) that both R¹ and R² are methyl i.e. that the 1,2-dialkyl imidazole is 1,2-dimethyl imidazole, or (2) that R¹ is an isopropyl group and R² is a methyl group, i.e. that the 1,2-dialkyl imidazole is 1-isopropyl-2-methyl imidazole. Alternatively, a mixture of 1,2-dialkyl imidazoles may be used. Some 1,2-dialkyl imidazoles are commercially available. Additionally, 1,2-dialkyl imidazoles may be prepared by the methods claimed in US-A-4921969 and -4927942. - The solvents for which 1,2-dialkyl imidazoles may be substituted, in whole or in part, include, but are not limited to, aromatic hydrocarbons, alcohols, ketones, esters, ethers, glycol ethers, alkylene carbonates and ureas. Examples of suitable co-solvents include one or more of the following: toluene, 2-ethyl-1-hexanol, ethylene glycol diacetate, 2-ethylhexyl acetate, N-methyl pyrrolidinone, tetrahydrofurfuryl alcohol, ethylene glycol butyl ether acetate, tetramethyl urea, diethylene glycol butyl ether, ethylene glycol butyl ether, methyl iso-amyl ketone, diethylene glycol methyl ether, dipropylene glycol methyl ether, dibasic ester, methyl isobutyl ketone, N,N'-dimethyl ethylene urea, propylene glycol methyl ether, cyclohexanone, diacetone alcohol, furfuryl alcohol, and isobutyl isobutyrate. Of course, the solvents for which 1,2-dialkyl imidazoles may be substituted, in whole or in part, include the more hazardous solvents mentioned at the beginning of the description. Optionally, other solvents may be added to the formulations of the present invention as well.
- Preferably, the portion of conventional solvent replaced with 1,2-dialkyl imidazole in a formulation containing one or more conventional (non-1,2-dialkyl imidazole) solvents will be such that the 1,2-dialkyl imidazole and the conventional solvents in the formulation are present in a weight ratio of 1,2-dialkyl imidazole to total conventional solvent of 4:1 to 1:4, more preferably from 1:2 to 1:3. One skilled in the art may find other weight ratios to be optimum without departing from the scope of the present invention. Those skilled in the art will appreciate that the portion of conventional solvent(s) in a formulation which should be replaced with 1,2-dialkyl imidazole for a given polyurethane foam involves a balance of possible reduction in dissolution power, against the reduction or avoidance of additional expense and/or environmental, health and safety risks associated with the conventional solvents. Applicant has demonstrated the use of several different formulations in the examples that follow.
- Optionally, other additives may be employed in the formulations used according to the present invention. For example, suitable thickeners may be included, such as ethylcellulose, hydroxypropyl cellulose, organic modified clay and hydrogenated castor oil,
- Surfactants, to enhance the water washability of the substrate, may also be included. Suitable surfactants include potassium oleate, the dioctyl ester of sodium sulfosuccinic acid, sodium alkylnaphthalene sulfonate and sodium alkylbenzene sulfonate.
- The process is effective at temperatures from room temperature to 100 °C and at pressures from atmospheric to several Megapascals. Optionally, the process of the present invention may be performed at an elevated temperature. While the process works well at room temperature, more rapid dissolution may be obtained by heating the 1,2-dialkyl imidazole-containing solvent formulation to a temeprature of 50 to 100°C. The solvent formulation may be applied to the polyurethane foam in any conventional manner. Typically, the polyurethane foam-coated substrate will be placed in a vat or sonic bath containing the solvent formulation. Alternatively, the sovlent formulation could be applied to the foam-coated substrate by brush or spray. The period of time for which the solvent.
formulation should be permitted to work undisturbed on the polyurethane foam to be removed will vary, after which, agitation of the surfaces to be cleaned of the foam via wiping, brushing or scraping is preferred. - Rigid polyurethane foam formulations are well known in the art and are commercially available. Rigid foams are more highly cross-linked than either elastomers or flexible foams. Other characteristics generally true of rigid polyurethane foams include (1) a structure having a high percentage of closed cells; (2) low thermal conductivity; (3) nonreversible deformability; (4) good load-bearing ability; and (5) high dimensional stability. Generally, rigid polyurethane foams are based on polyols having a molecular weight less than 1000, and more often from 400 to 800, and
a functionality of 2 to 8, and more typically from 4 to 8. - Flexible polyurethane foam formulations also are well known in the art and are commercially available. In contrast to rigid foams, flexible foams are not highly cross-linked. Other characteristics generally true of flexible polyurethane foams include (1) a structure having a high percentage of open cells; (2) air permeability; (3) reversible deformability; (4) a limited resistance to an applied load; and (5) low dimensional stability. Generally, flexible polyurethane foams are based on polyols having a molecular weight greater than 1000 (about 70 atoms or more per chain), and
a functionality of 2 to 4, and more typically of 2 to 3. The invention will be further illustrated by the following examples, - In the examples recorded in the Table below, the following procedure was used. Previously coated stainless steel 19 mm (3/4'') screw stock rods were wire brushed and cleaned with a solvent. Rods that had been coated with cured fiberglass were treated with acetone to remove any fiberglass residue; those that had been coated with cured flexible or rigid polyurethane foam were treated with methylene chloride. The rods were then sand blasted with micro beads. The rods were then coated with a rigid or flexible polyether-based foam formulation having the following components:
Rigid Foam Component Parts by Weight Thanol® R-350-X 36.9 DC-193¹ (silicon surfactant) 0.5 R11 (trichlorofluoromethane) 15.0 TEXACAT® TD-33 0.3 Rubinate M² (polymeric isocyanate) 49.6 ¹Dow Corning; ²ICI. -
Flexible Foam Component Parts by Weight Thanol® SF-5505¹ 60.0 Niax® 34-28 Polymer Polyol² 40.0 Deionized Water 3.5 Diethanolamine 1.5 Silicon Oil L-5309³ 1.5 TEXACAT®-33A⁴ (33 % TEDA in DPG) 0.5 UL-1 (organotin in cmp.)⁵ 0.0065 Toluene diisocyanate 44.5 ¹Arco; ²Union Carbide; ³Union Carbide; ⁴Texaco Chemical Co.; ⁵Witco Fomrez®. -
Ex. No. Foam Type Solvent System Components Weight Ratio of Components Approximate % Foam Removed 1 Cured Flexible 1-isopropyl-2-methyl imidazole All 100 % 2 Cured Flexible N,N-dimethylformamide All 100 % 3 Cured Rigid 1,2-dimethyl imidazole All 100 % 4 Cured Rigid N,N-dimethylformamide All 100 % 5 Cured Rigid PC/1,2-dimethyl imidazole 70/110 60 % 6 Cured Rigid PC/1,2-dimethyl imidazole 90/90 50 % PC = Propylene carbonate.
Claims (10)
- A process for dissolving polyurethane foam, by contacting polyurethane foam with a solvent, characterised in that the solvent comprises a 1,2-dialkyl imidazole.
- A process according to Claim 1 or 2 characterised in that the 1,2-dialkyl imidazole is 1,2-dimethyl imidazole or 1-isopropyl-2-methyl imidazole.
- A process according to any one of Claims 1 to 3 characterised in that the polyurethane foam is a rigid polyurethane foam.
- A process according to any one of Claims 1 to 3 characterised in that the polyurethane foam is a flexible polyurethane foam.
- A process according to Claim 5 or 6 characterised in that the polyurethane foam is a polyether-based polyurethane foam.
- A process according to any one of Claims 1 to 6 characterised in that the 1,2-dialkyl imidazole is employed together with a second solvent in which said polyurethane foam is at least partially soluble.
- A process according to Claim 7 characterised in that the second solvent is an aromatic hydrocarbon, alcohol, ketone, ester, ether, glycol ether, alkylene carbonate, or urea.
- A process according to Claim 7 or 8 characterised in that the second solvent is toluene, 2-ethyl-1-hexanol, ethylene glycol diacetate, 2-ethylhexyl acetate, N-methyl pyrrolidinone, tetrahydrofurfuryl alcohol, ethylene glycol butyl ether acetate, tetramethyl urea, diethylene glycol butyl ether, ethylene glycol butyl ether, methyl iso-amyl ketone, diethylene glycol methyl ether, dipropylene glycol methyl ether, dibasic ester, methyl isobutyl ketone, N,N'-dimethyl ethylene urea, propylene glycol methyl ether, cyclohexanone, diacetone alcohol, furfuryl alcohol, or isobutyl isobutyrate.
- A process according to any one of Claims 1 to 9 characterised in that the polyurethane foam is dissolved to remove it from a substrate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US677927 | 1984-12-04 | ||
US07/677,927 US5183514A (en) | 1991-04-01 | 1991-04-01 | Process for dissolving or removing rigid polyurethane foam by contacting with 1,2-dimethyl imidazole |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0507426A1 true EP0507426A1 (en) | 1992-10-07 |
Family
ID=24720675
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19920300034 Withdrawn EP0507426A1 (en) | 1991-04-01 | 1992-01-03 | Process for dissolving polyurethane foams or removing them from substrates |
Country Status (4)
Country | Link |
---|---|
US (1) | US5183514A (en) |
EP (1) | EP0507426A1 (en) |
JP (1) | JPH05171077A (en) |
CA (1) | CA2063362A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000050524A1 (en) * | 1999-02-25 | 2000-08-31 | Huntsman Petrochemical Corporation | Alkylene carbonate-based cleaners |
US6548464B1 (en) | 2000-11-28 | 2003-04-15 | Huntsman Petrochemical Corporation | Paint stripper for aircraft and other multicoat systems |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4124246A1 (en) * | 1991-07-22 | 1993-01-28 | Henkel Kgaa | CLEANING AGENT FOR ELECTRONIC AND ELECTRICAL ASSEMBLIES |
US5415800A (en) * | 1993-06-09 | 1995-05-16 | Motsenbocker; Gregg | Cleanser for releasing adherent deposits from surfaces |
US6929702B1 (en) | 2000-10-02 | 2005-08-16 | Gregg Motsenbocker | Compositions and methods for releasing adherent deposits from surfaces and substrates |
JP5540917B2 (en) * | 2010-06-15 | 2014-07-02 | 横浜ゴム株式会社 | Paint remover |
EP2460860A1 (en) * | 2010-12-02 | 2012-06-06 | Basf Se | Use of mixtures for removing polyurethanes from metal surfaces |
US20140034331A1 (en) * | 2012-08-01 | 2014-02-06 | Baker Hughes Incorporated | Fluid Mixture for Softening a Downhole Device |
JP5875968B2 (en) * | 2012-12-07 | 2016-03-02 | 株式会社カネコ化学 | Polyurethane foam volume reducing and solidifying agent |
AU2013386732B2 (en) | 2013-04-18 | 2018-10-18 | Xi'an Libang Pharmaceutical Technology Co., Ltd. | Ester derivative of 7-alpha-[9-(4,4,5,5,5-pentafluoropentylsulphinyl)nonyl]oestra-1,3,5(10)-triene-3,17beta-diol having antitumour activity and preparation method thereof |
KR101507530B1 (en) * | 2013-09-27 | 2015-04-07 | 주식회사 금오공업 | Separation chemical mixture and mechanical method of urethane film from automotive instrument panel skin for TPO recycle |
US10245887B2 (en) | 2015-07-23 | 2019-04-02 | Bridgestrone Americas Tire Operations, LLC | Methods relating to polyurethane foam-containing and degradable foam-containing tires, and degradable foam-containing tires |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1093884A (en) * | 1964-03-30 | 1967-12-06 | Bridgestone Tire Co Ltd | Method of recovering polyol and amine derivatives by the decomposition of polyurethane substances |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USRE27432E (en) * | 1970-07-02 | 1972-07-11 | Solvent cleaning system | |
US4120810A (en) * | 1974-10-07 | 1978-10-17 | Palmer David A | Paint remover with improved safety characteristics |
US4028299A (en) * | 1975-05-02 | 1977-06-07 | The Dow Chemical Company | Solid, rapid-setting, rigid polyurethanes |
US4009048A (en) * | 1975-07-11 | 1977-02-22 | Air Products And Chemicals, Inc. | Solvent cleaning and recovery process |
US4309300A (en) * | 1979-05-04 | 1982-01-05 | Mcdonnell Douglas Corporation | Cleaning solvent and method of cleaning a metal surface |
US4704234A (en) * | 1983-01-17 | 1987-11-03 | American Cyanamid Company | Compositions comprising imidazole, pyrazole or derivatives thereof for removing undesirable organic matter from a surface |
US4514530A (en) * | 1983-07-05 | 1985-04-30 | Texaco Inc. | Modified amine curing agents and epoxy resins cured therewith |
-
1991
- 1991-04-01 US US07/677,927 patent/US5183514A/en not_active Expired - Fee Related
-
1992
- 1992-01-03 EP EP19920300034 patent/EP0507426A1/en not_active Withdrawn
- 1992-03-18 CA CA 2063362 patent/CA2063362A1/en not_active Abandoned
- 1992-04-01 JP JP10525992A patent/JPH05171077A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1093884A (en) * | 1964-03-30 | 1967-12-06 | Bridgestone Tire Co Ltd | Method of recovering polyol and amine derivatives by the decomposition of polyurethane substances |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000050524A1 (en) * | 1999-02-25 | 2000-08-31 | Huntsman Petrochemical Corporation | Alkylene carbonate-based cleaners |
US6548464B1 (en) | 2000-11-28 | 2003-04-15 | Huntsman Petrochemical Corporation | Paint stripper for aircraft and other multicoat systems |
Also Published As
Publication number | Publication date |
---|---|
CA2063362A1 (en) | 1992-10-02 |
US5183514A (en) | 1993-02-02 |
JPH05171077A (en) | 1993-07-09 |
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